Answers

Yes, your controller can be fixed. Likely you have an Omron S6 PLC.
You may get lucky and find the Omron S6 on Ebay, and may be able to
move the Eprom from the old to the new one. If not the program is
pretty stright forward and another PLC like a Direct Logic DL-06
could be adapted to the system with not much fuss.

BTW Fred, dont let the memory unit on the PLC out of your sight!! The
PLC program is stored on a chip in a small box that fits into the
left side of the face of the PLC. It is very likely that the program
is still ok.